ASTM D1093 – Acidity of Hydrocarbon Liquids and Their Distillation Residues
Oil refining involves a series distillations that separate petroleum into fractions based on boiling point. After the highest boiling fraction is removed, a residue remains that may be further processed to make asphalt, petroleum waxes and other materials. The acidity or basicity of the residue helps determine further processing steps. Likewise the acidity or basicity of the initial hydrocarbon mixture may be important for processing considerations. This test determines the acidity or basicity of hydrocarbon liquids and their distillation residues.
Water is added to the sample, the mixture is vigorously shaken, centrifuged and the layers are separated. If the acidity is to be determined, methyl orange indicator is added. If the resulting solution is pink or red solution it is reported as “acidic”. If basicity is to be determined, phenolphthalein is added and if the resulting solution is pink or red, the material is reported as “basic”. To determine the acidity or basicity of the distillation residue, the hydrocarbon is distilled according to ASTM D86 or ASTM D1078, water is added to the resulting residue, and the mixture is shaken, centrifuged, analyzed as above and reported as “acidic” or “basic”.
Sample size: 100 ml
- ASTM D664 – Acid Number, Potentiometric, 2001 or 2004 or 2009 or 2011A version
- ASTM D664 – Acid Number, Strong, 2001 or 2004 or 2009 or 2011A version
- ASTM D974 – Acid and Base Number by Color-Indicator Titratiion; Neutralization Number
- ASTM D1613 – Acidity in Volatile Solvents & Chemical Intermediates
- ASTM D2110 – pH of Water Extracted from Halogenated Organic Solvents
- ASTM D2896 – Base Number – Perchloric Acid Method
- ASTM D4739 – Base Number Total, by Hydrochloric Acid Method
- ASTM E70 – pH of Aqueous Solutions with Glass Electrode
- ISO 6618 – Acid Number